Tundra Crewmax shortbed pull a 5th wheel?

DS and I saw a Tundra pulling a Sprinter 5er last week and we both did a double take. Back of truck was squatting pretty good, but he kept on a trucking w/ his buddy right into local Cracker Barrel. Don't know if it was a crew max but def a ext/double cab. What's just as scary is how truck mfr's are marketing their 1/2 tons to tow 10-12,000 lbs. No thanks. That's 3/4-1 ton territory.